hello all I have a 87 donzi with a stock 454. I want to put a small cam in it . the cam specs are 262/268 duration and .505/.515 lift . I want to know if I should worry about valve to piston clearance? it does have small dome pistons but I am not 4 sure how big of a dome it was all stock so what ever it came with is what it has. Thanx 4 any help

That is about the same size as a stock 454mag cam. You should not have any clearance issues.